HP EliteBook 840 G4 Notebook PC HP EliteBook 848 G4 Notebook PC Maintenance and Service Guide

Touchpad board
Description Spare part number
Touchpad board without NFC antenna 821171-001
Touchpad board with NFC antenna 821172-001
Before removing the touchpad board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the bottom cover (see Bottom cover on page 32).
5. Remove the battery (see Battery on page 36).
6. Remove the keyboard (see Keyboard on page 47).
7. Remove the internal base plate (see Internal base plate on page 50
Remove the touchpad board:
1. Disconnect the cable from the touchpad to the smart card reader board (1), and then disconnect the NFC
antenna from the NFC module (2).
2. Lift the tape (3), and then remove the 2 Phillips M2.5x2.5 screws (4) that secure the touchpad button
board to the computer.
3. Lift the top of the touchpad board up, and then pull it forward to remove it from the computer (5).
Reverse this procedure to install the touchpad board.
Component replacement procedures 57